drivers/soundwire/mipi_disco.c

   1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
   2 // Copyright(c) 2015-17 Intel Corporation.
   3
   4 /*
   5  * MIPI Discovery And Configuration (DisCo) Specification for SoundWire
   6  * specifies properties to be implemented for SoundWire Masters and Slaves.
   7  * The DisCo spec doesn't mandate these properties. However, SDW bus cannot
   8  * work without knowing these values.
   9  *
  10  * The helper functions read the Master and Slave properties. Implementers
  11  * of Master or Slave drivers can use any of the below three mechanisms:
  12  *    a) Use these APIs here as .read_prop() callback for Master and Slave
  13  *    b) Implement own methods and set those as .read_prop(), but invoke
  14  *    APIs in this file for generic read and override the values with
  15  *    platform specific data
  16  *    c) Implement ones own methods which do not use anything provided
  17  *    here
  18  */
  19
  20 #include <linux/device.h>
  21 #include <linux/property.h>
  22 #include <linux/mod_devicetable.h>
  23 #include <linux/soundwire/sdw.h>
  24 #include "bus.h"
  25
  26 /**
  27  * sdw_master_read_prop() - Read Master properties
  28  * @bus: SDW bus instance
  29  */
  30 int sdw_master_read_prop(struct sdw_bus *bus)
  31 {
  32         struct sdw_master_prop *prop = &bus->prop;
  33         struct fwnode_handle *link;
  34         char name[32];
  35         int nval, i;
  36
  37         device_property_read_u32(bus->dev,
  38                                  "mipi-sdw-sw-interface-revision",
  39                                  &prop->revision);
  40
  41         /* Find master handle */
  42         snprintf(name, sizeof(name),
  43                  "mipi-sdw-link-%d-subproperties", bus->link_id);
  44
  45         link = device_get_named_child_node(bus->dev, name);
  46         if (!link) {
  47                 dev_err(bus->dev, "Master node %s not found\n", name);
  48                 return -EIO;
  49         }
  50
  51         if (fwnode_property_read_bool(link,
  52                                       "mipi-sdw-clock-stop-mode0-supported"))
  53                 prop->clk_stop_modes |= BIT(SDW_CLK_STOP_MODE0);
  54
  55         if (fwnode_property_read_bool(link,
  56                                       "mipi-sdw-clock-stop-mode1-supported"))
  57                 prop->clk_stop_modes |= BIT(SDW_CLK_STOP_MODE1);
  58
  59         fwnode_property_read_u32(link,
  60                                  "mipi-sdw-max-clock-frequency",
  61                                  &prop->max_clk_freq);
  62
  63         nval = fwnode_property_count_u32(link, "mipi-sdw-clock-frequencies-supported");
  64         if (nval > 0) {
  65                 prop->num_clk_freq = nval;
  66                 prop->clk_freq = devm_kcalloc(bus->dev, prop->num_clk_freq,
  67                                               sizeof(*prop->clk_freq),
  68                                               GFP_KERNEL);
  69                 if (!prop->clk_freq)
  70                         return -ENOMEM;
  71
  72                 fwnode_property_read_u32_array(link,
  73                                 "mipi-sdw-clock-frequencies-supported",
  74                                 prop->clk_freq, prop->num_clk_freq);
  75         }
  76
  77         /*
  78          * Check the frequencies supported. If FW doesn't provide max
  79          * freq, then populate here by checking values.
  80          */
  81         if (!prop->max_clk_freq && prop->clk_freq) {
  82                 prop->max_clk_freq = prop->clk_freq[0];
  83                 for (i = 1; i < prop->num_clk_freq; i++) {
  84                         if (prop->clk_freq[i] > prop->max_clk_freq)
  85                                 prop->max_clk_freq = prop->clk_freq[i];
  86                 }
  87         }
  88
  89         nval = fwnode_property_count_u32(link, "mipi-sdw-supported-clock-gears");
  90         if (nval > 0) {
  91                 prop->num_clk_gears = nval;
  92                 prop->clk_gears = devm_kcalloc(bus->dev, prop->num_clk_gears,
  93                                                sizeof(*prop->clk_gears),
  94                                                GFP_KERNEL);
  95                 if (!prop->clk_gears)
  96                         return -ENOMEM;
  97
  98                 fwnode_property_read_u32_array(link,
  99                                                "mipi-sdw-supported-clock-gears",
 100                                                prop->clk_gears,
 101                                                prop->num_clk_gears);
 102         }
 103
 104         fwnode_property_read_u32(link, "mipi-sdw-default-frame-rate",
 105                                  &prop->default_frame_rate);
 106
 107         fwnode_property_read_u32(link, "mipi-sdw-default-frame-row-size",
 108                                  &prop->default_row);
 109
 110         fwnode_property_read_u32(link, "mipi-sdw-default-frame-col-size",
 111                                  &prop->default_col);
 112
 113         prop->dynamic_frame =  fwnode_property_read_bool(link,
 114                         "mipi-sdw-dynamic-frame-shape");
 115
 116         fwnode_property_read_u32(link, "mipi-sdw-command-error-threshold",
 117                                  &prop->err_threshold);
 118
 119         return 0;
 120 }
 121 EXPORT_SYMBOL(sdw_master_read_prop);
 122
 123 static int sdw_slave_read_dp0(struct sdw_slave *slave,
 124                               struct fwnode_handle *port,
 125                               struct sdw_dp0_prop *dp0)
 126 {
 127         int nval;
 128
 129         fwnode_property_read_u32(port, "mipi-sdw-port-max-wordlength",
 130                                  &dp0->max_word);
 131
 132         fwnode_property_read_u32(port, "mipi-sdw-port-min-wordlength",
 133                                  &dp0->min_word);
 134
 135         nval = fwnode_property_count_u32(port, "mipi-sdw-port-wordlength-configs");
 136         if (nval > 0) {
 137
 138                 dp0->num_words = nval;
 139                 dp0->words = devm_kcalloc(&slave->dev,
 140                                           dp0->num_words, sizeof(*dp0->words),
 141                                           GFP_KERNEL);
 142                 if (!dp0->words)
 143                         return -ENOMEM;
 144
 145                 fwnode_property_read_u32_array(port,
 146                                 "mipi-sdw-port-wordlength-configs",
 147                                 dp0->words, dp0->num_words);
 148         }
 149
 150         dp0->BRA_flow_controlled = fwnode_property_read_bool(port,
 151                                 "mipi-sdw-bra-flow-controlled");
 152
 153         dp0->simple_ch_prep_sm = fwnode_property_read_bool(port,
 154                                 "mipi-sdw-simplified-channel-prepare-sm");
 155
 156         dp0->imp_def_interrupts = fwnode_property_read_bool(port,
 157                                 "mipi-sdw-imp-def-dp0-interrupts-supported");
 158
 159         return 0;
 160 }
 161
 162 static int sdw_slave_read_dpn(struct sdw_slave *slave,
 163                               struct sdw_dpn_prop *dpn, int count, int ports,
 164                               char *type)
 165 {
 166         struct fwnode_handle *node;
 167         u32 bit, i = 0;
 168         int nval;
 169         unsigned long addr;
 170         char name[40];
 171
 172         addr = ports;
 173         /* valid ports are 1 to 14 so apply mask */
 174         addr &= GENMASK(14, 1);
 175
 176         for_each_set_bit(bit, &addr, 32) {
 177                 snprintf(name, sizeof(name),
 178                          "mipi-sdw-dp-%d-%s-subproperties", bit, type);
 179
 180                 dpn[i].num = bit;
 181
 182                 node = device_get_named_child_node(&slave->dev, name);
 183                 if (!node) {
 184                         dev_err(&slave->dev, "%s dpN not found\n", name);
 185                         return -EIO;
 186                 }
 187
 188                 fwnode_property_read_u32(node, "mipi-sdw-port-max-wordlength",
 189                                          &dpn[i].max_word);
 190                 fwnode_property_read_u32(node, "mipi-sdw-port-min-wordlength",
 191                                          &dpn[i].min_word);
 192
 193                 nval = fwnode_property_count_u32(node, "mipi-sdw-port-wordlength-configs");
 194                 if (nval > 0) {
 195                         dpn[i].num_words = nval;
 196                         dpn[i].words = devm_kcalloc(&slave->dev,
 197                                                     dpn[i].num_words,
 198                                                     sizeof(*dpn[i].words),
 199                                                     GFP_KERNEL);
 200                         if (!dpn[i].words)
 201                                 return -ENOMEM;
 202
 203                         fwnode_property_read_u32_array(node,
 204                                         "mipi-sdw-port-wordlength-configs",
 205                                         dpn[i].words, dpn[i].num_words);
 206                 }
 207
 208                 fwnode_property_read_u32(node, "mipi-sdw-data-port-type",
 209                                          &dpn[i].type);
 210
 211                 fwnode_property_read_u32(node,
 212                                          "mipi-sdw-max-grouping-supported",
 213                                          &dpn[i].max_grouping);
 214
 215                 dpn[i].simple_ch_prep_sm = fwnode_property_read_bool(node,
 216                                 "mipi-sdw-simplified-channelprepare-sm");
 217
 218                 fwnode_property_read_u32(node,
 219                                          "mipi-sdw-port-channelprepare-timeout",
 220                                          &dpn[i].ch_prep_timeout);
 221
 222                 fwnode_property_read_u32(node,
 223                                 "mipi-sdw-imp-def-dpn-interrupts-supported",
 224                                 &dpn[i].imp_def_interrupts);
 225
 226                 fwnode_property_read_u32(node, "mipi-sdw-min-channel-number",
 227                                          &dpn[i].min_ch);
 228
 229                 fwnode_property_read_u32(node, "mipi-sdw-max-channel-number",
 230                                          &dpn[i].max_ch);
 231
 232                 nval = fwnode_property_count_u32(node, "mipi-sdw-channel-number-list");
 233                 if (nval > 0) {
 234                         dpn[i].num_channels = nval;
 235                         dpn[i].channels = devm_kcalloc(&slave->dev,
 236                                                        dpn[i].num_channels,
 237                                                        sizeof(*dpn[i].channels),
 238                                                  GFP_KERNEL);
 239                         if (!dpn[i].channels)
 240                                 return -ENOMEM;
 241
 242                         fwnode_property_read_u32_array(node,
 243                                         "mipi-sdw-channel-number-list",
 244                                         dpn[i].channels, dpn[i].num_channels);
 245                 }
 246
 247                 nval = fwnode_property_count_u32(node, "mipi-sdw-channel-combination-list");
 248                 if (nval > 0) {
 249                         dpn[i].num_ch_combinations = nval;
 250                         dpn[i].ch_combinations = devm_kcalloc(&slave->dev,
 251                                         dpn[i].num_ch_combinations,
 252                                         sizeof(*dpn[i].ch_combinations),
 253                                         GFP_KERNEL);
 254                         if (!dpn[i].ch_combinations)
 255                                 return -ENOMEM;
 256
 257                         fwnode_property_read_u32_array(node,
 258                                         "mipi-sdw-channel-combination-list",
 259                                         dpn[i].ch_combinations,
 260                                         dpn[i].num_ch_combinations);
 261                 }
 262
 263                 fwnode_property_read_u32(node,
 264                                 "mipi-sdw-modes-supported", &dpn[i].modes);
 265
 266                 fwnode_property_read_u32(node, "mipi-sdw-max-async-buffer",
 267                                          &dpn[i].max_async_buffer);
 268
 269                 dpn[i].block_pack_mode = fwnode_property_read_bool(node,
 270                                 "mipi-sdw-block-packing-mode");
 271
 272                 fwnode_property_read_u32(node, "mipi-sdw-port-encoding-type",
 273                                          &dpn[i].port_encoding);
 274
 275                 /* TODO: Read audio mode */
 276
 277                 i++;
 278         }
 279
 280         return 0;
 281 }
 282
 283 /**
 284  * sdw_slave_read_prop() - Read Slave properties
 285  * @slave: SDW Slave
 286  */
 287 int sdw_slave_read_prop(struct sdw_slave *slave)
 288 {
 289         struct sdw_slave_prop *prop = &slave->prop;
 290         struct device *dev = &slave->dev;
 291         struct fwnode_handle *port;
 292         int num_of_ports, nval, i, dp0 = 0;
 293
 294         device_property_read_u32(dev, "mipi-sdw-sw-interface-revision",
 295                                  &prop->mipi_revision);
 296
 297         prop->wake_capable = device_property_read_bool(dev,
 298                                 "mipi-sdw-wake-up-unavailable");
 299         prop->wake_capable = !prop->wake_capable;
 300
 301         prop->test_mode_capable = device_property_read_bool(dev,
 302                                 "mipi-sdw-test-mode-supported");
 303
 304         prop->clk_stop_mode1 = false;
 305         if (device_property_read_bool(dev,
 306                                 "mipi-sdw-clock-stop-mode1-supported"))
 307                 prop->clk_stop_mode1 = true;
 308
 309         prop->simple_clk_stop_capable = device_property_read_bool(dev,
 310                         "mipi-sdw-simplified-clockstopprepare-sm-supported");
 311
 312         device_property_read_u32(dev, "mipi-sdw-clockstopprepare-timeout",
 313                                  &prop->clk_stop_timeout);
 314
 315         device_property_read_u32(dev, "mipi-sdw-slave-channelprepare-timeout",
 316                                  &prop->ch_prep_timeout);
 317
 318         device_property_read_u32(dev,
 319                         "mipi-sdw-clockstopprepare-hard-reset-behavior",
 320                         &prop->reset_behave);
 321
 322         prop->high_PHY_capable = device_property_read_bool(dev,
 323                         "mipi-sdw-highPHY-capable");
 324
 325         prop->paging_support = device_property_read_bool(dev,
 326                         "mipi-sdw-paging-support");
 327
 328         prop->bank_delay_support = device_property_read_bool(dev,
 329                         "mipi-sdw-bank-delay-support");
 330
 331         device_property_read_u32(dev,
 332                         "mipi-sdw-port15-read-behavior", &prop->p15_behave);
 333
 334         device_property_read_u32(dev, "mipi-sdw-master-count",
 335                                  &prop->master_count);
 336
 337         device_property_read_u32(dev, "mipi-sdw-source-port-list",
 338                                  &prop->source_ports);
 339
 340         device_property_read_u32(dev, "mipi-sdw-sink-port-list",
 341                                  &prop->sink_ports);
 342
 343         /* Read dp0 properties */
 344         port = device_get_named_child_node(dev, "mipi-sdw-dp-0-subproperties");
 345         if (!port) {
 346                 dev_dbg(dev, "DP0 node not found!!\n");
 347         } else {
 348                 prop->dp0_prop = devm_kzalloc(&slave->dev,
 349                                               sizeof(*prop->dp0_prop),
 350                                               GFP_KERNEL);
 351                 if (!prop->dp0_prop)
 352                         return -ENOMEM;
 353
 354                 sdw_slave_read_dp0(slave, port, prop->dp0_prop);
 355                 dp0 = 1;
 356         }
 357
 358         /*
 359          * Based on each DPn port, get source and sink dpn properties.
 360          * Also, some ports can operate as both source or sink.
 361          */
 362
 363         /* Allocate memory for set bits in port lists */
 364         nval = hweight32(prop->source_ports);
 365         prop->src_dpn_prop = devm_kcalloc(&slave->dev, nval,
 366                                           sizeof(*prop->src_dpn_prop),
 367                                           GFP_KERNEL);
 368         if (!prop->src_dpn_prop)
 369                 return -ENOMEM;
 370
 371         /* Read dpn properties for source port(s) */
 372         sdw_slave_read_dpn(slave, prop->src_dpn_prop, nval,
 373                            prop->source_ports, "source");
 374
 375         nval = hweight32(prop->sink_ports);
 376         prop->sink_dpn_prop = devm_kcalloc(&slave->dev, nval,
 377                                            sizeof(*prop->sink_dpn_prop),
 378                                            GFP_KERNEL);
 379         if (!prop->sink_dpn_prop)
 380                 return -ENOMEM;
 381
 382         /* Read dpn properties for sink port(s) */
 383         sdw_slave_read_dpn(slave, prop->sink_dpn_prop, nval,
 384                            prop->sink_ports, "sink");
 385
 386         /* some ports are bidirectional so check total ports by ORing */
 387         nval = prop->source_ports | prop->sink_ports;
 388         num_of_ports = hweight32(nval) + dp0; /* add DP0 */
 389
 390         /* Allocate port_ready based on num_of_ports */
 391         slave->port_ready = devm_kcalloc(&slave->dev, num_of_ports,
 392                                          sizeof(*slave->port_ready),
 393                                          GFP_KERNEL);
 394         if (!slave->port_ready)
 395                 return -ENOMEM;
 396
 397         /* Initialize completion */
 398         for (i = 0; i < num_of_ports; i++)
 399                 init_completion(&slave->port_ready[i]);
 400
 401         return 0;
 402 }
 403 EXPORT_SYMBOL(sdw_slave_read_prop);